Back light module and liquid crystal display

Abstract

A liquid crystal display (LCD) and a back light module are provided. The back light module includes a light guide plate (LGP) and a plurality of light-emitting devices. The LGP has a plurality of partitioning grooves, a bottom surface, a light exiting surface, a first side and a second side. The bottom surface is opposite to the light exiting surface. The first side and the second side are located at the two opposite side surfaces of the LGP. The extension direction of each of the partitioning grooves extends from the first side towards the second side. Each of the partitioning grooves has an opening and the opening is located at the bottom surface. The plurality of light-emitting devices are disposed at least one of the first side and the second side. The liquid crystal panel of the LCD is disposed at the light exiting surface.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 99124497, filed on Jul. 23, 2010. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention generally relates to a back light module and a display apparatus, and more particularly, to a edge-type back light module and a liquid crystal display (LCD).[0004]2. Description of Related Art[0005]The LCD has played a major role in the mainstream display apparatus market in recent years due to advantages of low voltage operation, no radiation, light and compact design. An LCD mainly includes a liquid crystal panel and a back light module, wherein the back light module is for providing a planar light source required by the liquid crystal panel so as to make the LCD displaying. The LCD controls the rotations of the liqui...

AI Technical Summary

Benefits of technology

The patent describes a new design for a back light module and LCD screen that uses grooves to create separate light sources for each region. This design helps improve the optical quality and saves time during assembly.

Problems solved by technology

Since the positions of the images of a same moving object come from the successive frames staying on the retinas are different, the double image phenomena are presented, which leads to blurry image profiles and further gives the display quality of the LCD a negative impact.

However, the direct-type back light module has a disadvantage of larger overall thickness.

Although the edge-type back light module is advantageous in smaller overall thickness, but the plurality of sub-LGPs are not easy to be well aligned, which is resulted in poor optical quality.

In addition, with a edge-type back light module, since each independent sub-LGP has a manufacturing tolerance, the length, the width and the thickness thereof have inconsistency from each other, hence after assembling, the optical quality of each region is uneven from the other regions, and bright lines likely appear at the seams between the independent sub-LGPs.

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